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A method for preparing y4si2o7n2 powder material by microwave method

A y4si2o7n2, powder material technology, applied in the field of high-temperature functional/structural ceramics, can solve the problems of long time consumption and high synthesis temperature, and achieve the effect of single-phase purity, low synthesis temperature, uniform and fine particles

Active Publication Date: 2015-08-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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Problems solved by technology

Its disadvantage is that the synthesis temperature is high, it takes a long time, and the obtained sample contains Y 2 o 3 Impurity phase

Method used

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  • A method for preparing y4si2o7n2 powder material by microwave method
  • A method for preparing y4si2o7n2 powder material by microwave method

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Effect test

Embodiment 1

[0025] weigh Y 2 o 3 Powder (purity: 99.99wt.%) 32.75g, SiO 2 Powder (purity: 99wt.%) 2.13g, Si 3 N 4 5.08 g of the powder (purity: ≥95 wt.%) was poured into a silicon nitride ball mill jar, 20-50 ml of analytically pure absolute ethanol was added, and wet-mixed with a silicon nitride ball for 24 hours. After that, it was dried in an oven at 70° C. in the air for 8 hours. After drying, use a 100-mesh sieve to separate the powder from the silicon nitride balls. Put the mixed raw material powder obtained after separation into an alumina crucible, place the alumina crucible in an alumina insulation barrel, and evenly arrange a layer of SiC sheets around the alumina crucible. Put the heat preservation barrel into a high-temperature microwave oven, and under the protection of a circulating nitrogen atmosphere, raise the temperature to 1350°C at a heating rate of 20°C / min, and keep it warm for 60min. After cooling with the furnace, the obtained powder material is analyzed by X...

Embodiment 2

[0027] weigh Y 2 o 3 Powder (purity: 99.99wt.%) 32.75g, SiO 2 Powder (purity: 99wt.%) 2.21g, Si 3 N 4 Powder (purity: ≥95wt.%) 5.18g was poured into a silicon nitride ball mill jar, 20-50ml analytical pure absolute ethanol was added, and wet mixed with silicon nitride balls for 24 hours. After that, it was dried in an oven at 70° C. in the air for 8 hours. After drying, use a 100-mesh sieve to separate the powder from the silicon nitride balls. Put the mixed raw material powder obtained after separation into an alumina crucible. Put the heat preservation bucket into a high-temperature microwave oven, and under the protection of a circulating nitrogen atmosphere, raise the temperature to 1450°C at a heating rate of 20°C / min, and keep it warm for 60min. After cooling with the furnace, the obtained powder material is analyzed by X-ray diffraction as a single pure Y 4 Si 2 o 7 N 2 Mutually. The particle size distribution of the prepared powder material is about 0.5-3 μm...

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Abstract

The invention belongs to the field of high-temperature functional / structural ceramics, and more specifically, relates to a method for preparing an Y4Si2O7N2 powder material by using a microwave method. The invention provides a method for preparing an Y4Si2O7N2 powder material by using a microwave method. The method for preparing an Y4Si2O7N2 powder material by using a microwave method is implemented by taking yttrium oxide powder (Y2O3), silicon oxide powder (SiO2) and silicon nitride powder (Si3N4) as raw materials, and the molar ratio of the raw materials is as follows: Y2O3:SiO2:Si3N4=4:(0.8-1.2):(0.8-1.2). The method is simple in process, low in cost and strong in maneuverability, and can obtain a single-phase pure yttrium silica oxynitride (Y4Si2O7N2) ceramic powder material in a shorter heat-preservation time at a lower temperature.

Description

technical field [0001] The invention belongs to the field of high-temperature functional / structural ceramics, more specifically, relates to a method for preparing Y 4 Si 2 o 7 N 2 Method for powder materials. Background technique [0002] Y 4 Si 2 o 7 N 2 Ceramic material is a new type of refractory ceramic material with a melting point as high as 1980°C. It has high hardness, high modulus, and good dielectric properties, so it can be used as a new type of high-temperature structural / functional ceramic. Since the ceramic has very low thermal conductivity, low density and high flexural strength at high temperature, Y 4 Si 2 o 7 N 2 It can also be used as a potential heat insulation material, and has potential wide application prospects in high-tech fields such as aviation, aerospace, nuclear industry, and ultra-high temperature structural parts. But since Y 4 Si 2 o 7 N 2 in Y 2 o 3 -SiO 2 -Si 3 N 4 There are many competitive phases in the system at high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/505C04B35/626
Inventor 周延春孙鲁超王京阳王杰民
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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